In this paper, the impact of sapling movements on VHF and UHF radio channels is experimentally investigated in a tropical rainforest. The reported information is based on the analysis and modeling of continuous-wave (CW) envelope fading waveforms. It is found that the sapling movements can affect the radio-wave propagations and cause the variations on the received fields. Moreover, statistical analysis shows that the induced temporal variations can be conveniently modeled using a Rician distribution function. Its Rician K factor gradually decreases as the frequency increases or there are sapling movements.